Sedimentary
Sedimentary rock is made from sediment or by other chemical reactions. Sediment is loose material, such as bits of rocks, minerals, plants and other animals. Water, wind, and ice can move sediment to a place where it can settle. Sedimentary rocks are usually formed in oceans and lakes were larger, the heavier fragments settle first, each layer of sediment is squeezed together by the weight above it.
A example os sedimentary rock is sandstone shown in picture.
A example os sedimentary rock is sandstone shown in picture.
Compaction
When rocks travel or get moved to a lake, pond or ocean they compact each other. The biggest rocks fall the shortest way the medium fall some way in the centerand the smallest fallthe farthest. Over time they compact and become another type of sedimentary rock.
Cementation
Minerals in rocks dissolve as water soaks into them which can make them become smaller rocks like as small as grains of sand sometimes if it's there for that amount of time. Also sand is actually rocks that have either been dissloved, broken or shatterd into tiny peices like sand at a beach or at the bottom of the seas or oceans.
http://video.ecb.org/badger/download/vlc/animations/thumbs/Cementation_.jpg
http://video.ecb.org/badger/download/vlc/animations/thumbs/Cementation_.jpg
Fossils
Unlike metamorphic rocks or igneous rocks, fossils can actually stay in the rock in certain areas because of the amounts of pressure and heat that destroy the fossils this is another part of sedimentary rocks. The sediment protects the fossils and that is what makes them fossils.
http://www.maropeng.co.za/images/uploads/fossil_lg.jpg dec 4, 2011
http://www.maropeng.co.za/images/uploads/fossil_lg.jpg dec 4, 2011